// returns actual CNC
static LS tok_combineCodeTokenRanges(LS tok, L<IntRange> ranges) {
  new LS tok2;
  int iTok = 0;
  for (IntRange r : ranges) {
    tok2.add(joinSubList(tok, iTok, r.start));
    tok2.add(joinSubList(tok, r.start, r.end));
    iTok = r.end;
  }
  tok2.add(joinSubList(tok, iTok));
  ret tok2;
}